I don't want to pay $5 for a complaining cup of coffee. Starbucks, with its great reputation for coffee and employee programs, is taking a slide I fear.
My cup of expensive coffee today was served with a "I don't know why they don't let us hire more employees. It is so busy here we need more help. Etc. etc. etc." Well, for one thing, I as a customer don't want to hear complaining, I want service with a smile. I don't doubt that you have your problems and when I ask about them, then you can let me know what you don't like. Until then I'd rather deal with my own issues and not yours. Maybe you just need to be a little faster to get the job done. Or, maybe read the paper/Internet and realize that your company is not having the best of times.
This issue is applicable to all companies not just the "that is a lot for a cup of coffee" company. Customers don't want to hear about your organizational problems unless you are going to pay them to listen to you complain.
Managers make sure your employees understand that difficult times are not a reason for them to share "their professional management opinion" with your customers.
Be professional and leave a positive impression.